We are seeing an ssue on the spurious emission test on 2G Band for EG91 -AUX
Applicable Standard: EN 301 511
Frequency Band: GSM1800
Test Item: Spurious Emission above 1 GHz
When the product tested GPRS, the test frequency was 2 times of 1.7476G, the Horizontal polarization exceeded the limit by 2.46 dB ,and the vertical polarization exceeded the limit by 2.03 dB
We have tired disabling the GNSS LNA (including the RF trace to Quectel module) but no improvement.
May I know what other possibility that can cause the harmonics?
For your information, the antenna we used have S11 <-10dB with total efficiency >60%.